Not the most logical sequence <vbg>, but here is what I did for stage 5:
The left bottom sample starts with 4 red lines and reduces down to 1 line while the yellow goes exactly the other way round. To be honest I find this sample rather boring.
An other thing which we had to explore with this sample was to show more - or less - of the black background. With the chain stitch there is always some background visible, so I had to do something else with it. Instead of static straight lines, I decided to use wavy lines. All 5 lines start at the same spot, but they travel away from each other further down. Of the 4 samples I made this one is my favorite. It is the most dynamic of all.